[PATCH v4 07/12] pinctrl: single: change function mask default value

[Dario Binacchi]

The patch is inspired by more recent versions of the Linux driver.
Replacing the default value 0xffffffff of the function mask with 0 is
certainly more conservative in case the "pinctrl-single,function-mask"
DT property is missing.

Signed-off-by: Dario Binacchi <dariobin at libero.it>
Reviewed-by: Simon Glass <sjg at chromium.org>

---

(no changes since v3)

Changes in v3:
- Added Simon Glass review tag.

 drivers/pinctrl/pinctrl-single.c | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/drivers/pinctrl/pinctrl-single.c b/drivers/pinctrl/pinctrl-single.c
index 5ade108875..630a6c08b8 100644
--- a/drivers/pinctrl/pinctrl-single.c
+++ b/drivers/pinctrl/pinctrl-single.c
@@ -79,6 +79,10 @@ static int single_configure_pins(struct udevice *dev,
 	phys_addr_t reg;
 	u32 offset, val;
 
+	/* If function mask is null, needn't enable it. */
+	if (!pdata->mask)
+		return 0;
+
 	for (n = 0; n < count; n++, pins++) {
 		offset = fdt32_to_cpu(pins->reg);
 		if (offset < 0 || offset > pdata->offset) {
@@ -207,8 +211,12 @@ static int single_of_to_plat(struct udevice *dev)
 	}
 	pdata->base = addr;
 
-	pdata->mask = dev_read_u32_default(dev, "pinctrl-single,function-mask",
-					   0xffffffff);
+	ret = dev_read_u32(dev, "pinctrl-single,function-mask", &pdata->mask);
+	if (ret) {
+		pdata->mask = 0;
+		dev_warn(dev, "missing function register mask\n");
+	}
+
 	pdata->bits_per_mux = dev_read_bool(dev, "pinctrl-single,bit-per-mux");
 
 	return 0;
-- 
2.17.1